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MS-DOS/v1.25/source/COMMAND.ASM
Rich Turner fce0f75959 MS-DOS v1.25 Release
2018-09-21 17:51:26 -07:00

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; COMMAND version 1.17
;
; This version of COMMAND is divided into three distinct parts. First
; is the resident portion, which includes handlers for interrupts
; 22H (terminate), 23H (Cntrl-C), 24H (fatal error), and 27H (stay
; resident); it also has code to test and, if necessary, reload the
; transient portion. Following the resident is the init code, which is
; overwritten after use. Then comes the transient portion, which
; includes all command processing (whether internal or external).
; The transient portion loads at the end of physical memory, and it may
; be overlayed by programs that need as much memory as possible. When
; the resident portion of command regains control from a user program,
; a checksum is performed on the transient portion to see if it must be
; reloaded. Thus programs which do not need maximum memory will save
; the time required to reload COMMAND when they terminate.
;Use the following booleans to set assembly flags
FALSE EQU 0
TRUE EQU NOT FALSE
IBMVER EQU FALSE ;Switch to build IBM version of Command
MSVER EQU TRUE ;Switch to build MS-DOS version of Command
HIGHMEM EQU TRUE ;Run resident part above transient (high memory)
LINPERPAG EQU 23
NORMPERLIN EQU 1
WIDEPERLIN EQU 5
IF IBMVER
SYM EQU ">"
COMDRV EQU 1
ENDIF
IF MSVER
SYM EQU ":"
COMDRV EQU 0
ENDIF
FCB EQU 5CH
DSKRESET EQU 13
SETBASE EQU 38
SRCHFRST EQU 17
SRCHNXT EQU 18
RENAM EQU 23
INCHAR EQU 1
GETFAT EQU 27
OPEN EQU 15
CLOSE EQU 16
MAKE EQU 22
DELETE EQU 19
RDBLK EQU 39
WRBLK EQU 40
SETDMA EQU 26
SELDRV EQU 14
GETDRV EQU 25
PRINTBUF EQU 9
OUTCH EQU 2
INBUF EQU 10
GETDATE EQU 2AH
SETDATE EQU 2BH
GETTIME EQU 2CH
SETTIME EQU 2DH
RR EQU 33
RECLEN EQU 14
FILLEN EQU 16
OFFDATE EQU 20
;The following are all of the segments used in the load order
CODERES SEGMENT
CODERES ENDS
DATARES SEGMENT BYTE
DATARES ENDS
INIT SEGMENT BYTE
INIT ENDS
TAIL SEGMENT PARA
TAIL ENDS
TRANCODE SEGMENT PARA
TRANCODE ENDS
TRANDATA SEGMENT BYTE
TRANDATA ENDS
TRANSPACE SEGMENT BYTE
TRANSPACE ENDS
RESGROUP GROUP CODERES,DATARES,INIT,TAIL
TRANGROUP GROUP TRANCODE,TRANDATA,TRANSPACE
;Data for resident portion
DATARES SEGMENT BYTE
ORG 0
ZERO = $
MESBAS DW OFFSET RESGROUP:ERR0
DW OFFSET RESGROUP:ERR2
DW OFFSET RESGROUP:ERR4
DW OFFSET RESGROUP:ERR6
DW OFFSET RESGROUP:ERR8
DW OFFSET RESGROUP:ERR10
DW OFFSET RESGROUP:ERR12
ERR0 DB "Write protect$"
ERR2 DB "Not ready$"
ERR4 DB "Data$"
ERR6 DB "Seek$"
ERR8 DB "Sector not found$"
ERR10 DB "Write fault$"
ERR12 DB "Disk$"
READ DB "read$"
WRITE DB "writ$"
ERRMES DB " error "
IOTYP DB "writing"
DRVNUM DB " drive "
DRVLET DB "A"
NEWLIN DB 13,10,"$"
REQUEST DB "Abort, Retry, Ignore? $"
BADFAT DB 13,10,"File allocation table bad,$"
COMBAD DB 13,10,"Invalid COMMAND.COM"
NEEDCOM DB 13,10,"Insert DOS disk in "
IF IBMVER
DB "drive A"
ELSE
DB "default drive"
ENDIF
PROMPT DB 13,10,"and strike any key when ready",13,10,"$"
NEEDBAT DB 13,10,"Insert disk with batch file$"
ENDBATMES DB 13,10,"Terminate batch job (Y/N)? $"
LOADING DB 0
BATFCB DB 1,"AUTOEXECBAT"
DB 21 DUP(?)
DW 0
DW 0 ;Initialize RR field to zero
PARMTAB DW 10 DUP(-1) ;No parameters initially
BATCH DB 1 ;Assume batch mode initially
COMFCB DB COMDRV,"COMMAND COM"
DB 25 DUP(?)
TRANS DW OFFSET TRANGROUP:COMMAND
TRNSEG DW ?
BATBYT DB ?
MEMSIZ DW ?
SUM DW ?
INITADD DB 4 DUP(?)
RESDATASIZE EQU $-ZERO
DATARES ENDS
;Data for transient portion
TRANDATA SEGMENT BYTE
ORG 0
ZERO EQU $
BADNAM DB "Bad command or file name",13,10,"$"
MISNAM DB "Missing file name$"
RENERR DB "Duplicate file name or "
NOTFND DB "File not found$"
EXEBAD DB "Error in EXE file$"
NOSPACE DB "Insufficient disk space",13,10,"$"
FULDIR DB "File creation error",13,10,"$"
OVERWR DB "File cannot be copied onto itself",13,10,"$"
LOSTERR DB "Content of destination lost before copy",13,10,"$"
COPIED DB " File(s) copied$"
DIRMES DB " File(s)$"
TOOBIG DB "Program too big to fit in memory$"
BADDRV DB "Invalid drive specification$"
PAUSMES DB "Strike a key when ready . . . $"
BADSWT DB "Illegal switch",13,10,"$"
WEEKTAB DB "SunMonTueWedThuFriSat"
BADDAT DB 13,10,"Invalid date$"
CURDAT DB "Current date is $"
NEWDAT DB 13,10,"Enter new date: $"
BADTIM DB 13,10,"Invalid time$"
CURTIM DB "Current time is $"
NEWTIM DB 13,10,"Enter new time: $"
SUREMES DB "Are you sure (Y/N)? $"
COMTAB DB 4,"DIR",1
DW OFFSET TRANGROUP:CATALOG
DB 7,"RENAME",1
DW OFFSET TRANGROUP:RENAME
DB 4,"REN",1
DW OFFSET TRANGROUP:RENAME
DB 6,"ERASE",1
DW OFFSET TRANGROUP:ERASE
DB 4,"DEL",1
DW OFFSET TRANGROUP:ERASE
DB 5,"TYPE",1
DW OFFSET TRANGROUP:TYPEFIL
DB 4,"REM",1
DW OFFSET TRANGROUP:COMMAND
DB 5,"COPY",1
DW OFFSET TRANGROUP:COPY
DB 6,"PAUSE",1
DW OFFSET TRANGROUP:PAUSE
DB 5,"DATE",0
DW OFFSET TRANGROUP:DATE
DB 5,"TIME",0
DW OFFSET TRANGROUP:TIME
DB 0 ;Terminate command table
COMBUF DB 128,1,13
TRANDATASIZE EQU $-ZERO
TRANDATA ENDS
;Uninitialized transient data
TRANSPACE SEGMENT BYTE
ORG 0
ZERO = $
DB 128 DUP(?)
TPA DW 1 DUP(?)
RESSEG DW 1 DUP(?)
CHKDRV DB 1 DUP(?)
FILTYP DB 1 DUP(?)
CURDRV DB 1 DUP(?)
PARM1 DB 1 DUP(?)
PARM2 DB 1 DUP(?)
COMSW DW 1 DUP(?)
ARG1S DW 1 DUP(?)
ARG2S DW 1 DUP(?)
FLAGER DB 1 DUP(?)
CFLAG DB 1 DUP(?)
SPECDRV DB 1 DUP(?)
BYTCNT DW 1 DUP(?)
NXTADD DW 1 DUP(?)
LINCNT DB 1 DUP(?)
LINLEN DB 1 DUP(?)
FILECNT DW 1 DUP(?)
EXEFCB LABEL WORD
IDLEN DB 1 DUP(?)
ID DB 8 DUP(?)
COM DB 3 DUP(?)
DEST DB 37 DUP(?)
DESTNAME DB 11 DUP(?)
DIRBUF DB 37 DUP(?)
BITS DW 1 DUP(?)
FULLSCR DW 1 DUP(?)
EXEEND DW 1 DUP(?)
;Header variables for EXE file load
;These are overlapped with COPY variables, below
RUNVAR LABEL WORD
RELPT DW 1 DUP(?)
RELSEG DW 1 DUP(?)
PSIZE LABEL WORD
PAGES DW 1 DUP(?)
RELCNT DW 1 DUP(?)
HEADSIZ DW 1 DUP(?)
DW 1 DUP(?)
LOADLOW DW 1 DUP(?)
INITSS DW 1 DUP(?)
INITSP DW 1 DUP(?)
DW 1 DUP(?)
INITIP DW 1 DUP(?)
INITCS DW 1 DUP(?)
RELTAB DW 1 DUP(?)
RUNVARSIZ EQU $-RUNVAR
DB 80H DUP(?)
STACK LABEL WORD
PRETRLEN EQU $-ZERO ;Used later to compute TRNLEN
ORG RUNVAR-ZERO ;Overlaps EXE variables
SRCPT DW 1 DUP(?)
INEXACT DB 1 DUP(?)
APPEND DB 1 DUP(?)
NOWRITE DB 1 DUP(?)
ASCII DB 1 DUP(?)
PLUS DB 1 DUP(?)
SOURCE DB 11 DUP(?)
TRANSPACESIZE EQU $-ZERO
TRANSPACE ENDS
;START OF RESIDENT PORTION
CODERES SEGMENT
ASSUME CS:RESGROUP,DS:RESGROUP,ES:RESGROUP,SS:RESGROUP
ORG 0
ZERO = $
PARMBUF LABEL WORD
ORG 100H
RSTACK LABEL WORD
PROGSTART:
JMP CONPROC
LTPA DW 0 ;WILL STORE TPA SEGMENT HERE
MYSEG DW 0 ;Put our own segment here
CONTC:
MOV AX,CS
MOV DS,AX
MOV SS,AX
MOV SP,OFFSET RESGROUP:RSTACK
STI
CALL SETVECT
MOV AH,DSKRESET
INT 33 ;Reset disks in case files were open
TEST [BATCH],-1
JZ LODCOM
ASKEND:
MOV DX,OFFSET RESGROUP:ENDBATMES
MOV AH,PRINTBUF
INT 33
MOV AX,0C00H+INCHAR
INT 33
AND AL,5FH
CMP AL,"N"
JZ LODCOM
CMP AL,"Y"
JNZ ASKEND
MOV [BATCH],0
LODCOM:
MOV AX,CS
MOV SS,AX
MOV SP,OFFSET RESGROUP:RSTACK
MOV DS,AX
CALL SETVECT
CALL CHKSUM
CMP DX,[SUM]
JZ HAVCOM
MOV [LOADING],1
CALL LOADCOM
CHKSAME:
CALL CHKSUM
CMP DX,[SUM]
JZ HAVCOM
CALL WRONGCOM
JMP SHORT CHKSAME
HAVCOM:
MOV [LOADING],0
MOV SI,OFFSET RESGROUP:LTPA
MOV DI,OFFSET TRANGROUP:TPA
MOV ES,[TRNSEG]
CLD
MOVSW ;Move TPA segment to transient storage
MOVSW ;Move resident segment too
MOV AX,[MEMSIZ]
MOV WORD PTR ES:[2],AX
JMP DWORD PTR [TRANS]
RESIDENT:
ADD DX,15
MOV CL,4
SHR DX,CL ;Number of paragraphs of new addition
ADD CS:[LTPA],DX
XOR AX,AX
MOV DS,AX
JMP DWORD PTR DS:[80H] ;Pretend user executed INT 20H
DSKERR:
;******************************************************
; THIS IS THE DEFAULT DISK ERROR HANDLING CODE
; AVAILABLE TO ALL USERS IF THEY DO NOT TRY TO
; INTERCEPT INTERRUPT 24H.
;******************************************************
STI
PUSH DS
PUSH CS
POP DS ;Set up local data segment
PUSH DX
CALL CRLF
POP DX
ADD AL,"A" ;Compute drive letter
MOV [DRVLET],AL
TEST AH,80H ;Check if hard disk error
JNZ FATERR
MOV SI,OFFSET RESGROUP:READ
TEST AH,1
JZ SAVMES
MOV SI,OFFSET RESGROUP:WRITE
SAVMES:
LODSW
MOV WORD PTR [IOTYP],AX
LODSW
MOV WORD PTR [IOTYP+2],AX
AND DI,0FFH
CMP DI,12
JBE HAVCOD
MOV DI,12
HAVCOD:
MOV DI,WORD PTR [DI+MESBAS] ;Get pointer to error message
XCHG DI,DX ;May need DX later
MOV AH,PRINTBUF
INT 33 ;Print error type
MOV DX,OFFSET RESGROUP:ERRMES
INT 33
CMP [LOADING],0
JNZ GETCOMDSK
ASK:
MOV DX,OFFSET RESGROUP:REQUEST
MOV AH,PRINTBUF
INT 33
MOV AX,0C00H+INCHAR
INT 33 ;Get response
CALL CRLF
OR AL,20H ;Convert to lower case
MOV AH,0 ;Return code for ignore
CMP AL,"i" ;Ignore?
JZ EXIT
INC AH
CMP AL,"r" ;Retry?
JZ EXIT
INC AH
CMP AL,"a" ;Abort?
JNZ ASK
EXIT:
MOV AL,AH
MOV DX,DI
POP DS
IRET
FATERR:
MOV DX,OFFSET RESGROUP:BADFAT
MOV AH,PRINTBUF
INT 33
MOV DX,OFFSET RESGROUP:DRVNUM
INT 33
MOV AL,2 ;Abort
POP DS
IRET
GETCOMDSK:
MOV DX,OFFSET RESGROUP:NEEDCOM
MOV AH,PRINTBUF
INT 33
MOV AX,0C07H ;Get char without testing or echo
INT 33
JMP LODCOM
CRLF:
MOV DX,OFFSET RESGROUP:NEWLIN
PUSH AX
MOV AH,PRINTBUF
INT 33
POP AX
RET10: RET
LOADCOM:
PUSH DS
MOV DS,[TRNSEG]
MOV DX,100H
MOV AH,SETDMA
INT 33
POP DS
MOV DX,OFFSET RESGROUP:COMFCB
MOV AH,OPEN
INT 33 ;Open COMMAND.COM
OR AL,AL
JZ READCOM
MOV DX,OFFSET RESGROUP:NEEDCOM
PROMPTCOM:
MOV AH,PRINTBUF
INT 33
MOV AX,0C07H ;Get char without testing or echo
INT 33
JMP SHORT LOADCOM
READCOM:
MOV WORD PTR[COMFCB+RR],OFFSET RESGROUP:TRANSTART
XOR AX,AX
MOV WORD PTR[COMFCB+RR+2],AX
MOV [COMFCB],AL ;Use default drive
INC AX
MOV WORD PTR[COMFCB+RECLEN],AX
MOV CX,COMLEN
MOV DX,OFFSET RESGROUP:COMFCB
MOV AH,RDBLK
INT 33
OR AL,AL
JZ RET10
WRONGCOM:
MOV DX,OFFSET RESGROUP:COMBAD
JMP SHORT PROMPTCOM
CHKSUM:
CLD
PUSH DS
MOV DS,[TRNSEG]
MOV SI,100H
MOV CX,COMLEN
SHR CX,1
XOR DX,DX
CHK:
LODSW
ADD DX,AX
LOOP CHK
POP DS
RET
SETVECT:
MOV DX,OFFSET RESGROUP:LODCOM
MOV AX,2522H ;Set Terminate address
INT 21H
MOV DX,OFFSET RESGROUP:CONTC
MOV AX,2523H ;Set Ctrl-C address
INT 21H
MOV DX,OFFSET RESGROUP:DSKERR
MOV AX,2524H ;Set Hard Disk Error address
INT 33
MOV DX,OFFSET RESGROUP:RESIDENT
MOV AX,2527H ;Set Terminate and Stay Resident address
INT 33
RET
RESCODESIZE EQU $-ZERO
CODERES ENDS
;*******************************************************************
;START OF INIT PORTION
;This code is overlayed the first time the TPA is used.
INIT SEGMENT BYTE
ORG 0
ZERO = $
CONPROC:
MOV SP,OFFSET RESGROUP:RSTACK
IF HIGHMEM
MOV AX,WORD PTR DS:[2]
SUB AX,((RESCODESIZE+RESDATASIZE)+15)/16 ;Subtract size of resident
MOV WORD PTR DS:[2],AX
MOV ES,AX
MOV SI,100H
MOV DI,SI
MOV CX,((RESCODESIZE+RESDATASIZE)-100H+1)/2 ;Length of resident in words
REP MOVSW ;Move to end of memory
MOV DS,AX
MOV [LTPA],CS
ENDIF
IF NOT HIGHMEM
MOV AX,CS
ADD AX,((RESCODESIZE+RESDATASIZE)+15)/16 ;Compute segment of TPA
MOV [LTPA],AX
MOV AX,WORD PTR DS:[2]
ENDIF
MOV [MYSEG],DS
MOV [MEMSIZ],AX
SUB AX,TRNLEN ;Subtract size of transient
MOV [TRNSEG],AX
CALL SETVECT
CALL LOADCOM
CALL CHKSUM
MOV [SUM],DX
IF MSVER
IF HIGHMEM
PUSH DS
PUSH CS
POP DS
ENDIF
MOV DX,OFFSET RESGROUP:HEADER
MOV AH,PRINTBUF
INT 33
IF HIGHMEM
POP DS
ENDIF
ENDIF
MOV DX,OFFSET RESGROUP:BATFCB
MOV AH,OPEN
INT 33 ;See if AUTOEXEC.BAT exists
MOV WORD PTR[BATFCB+RECLEN],1 ;Set record length to 1
OR AL,AL ;Zero means file found
JZ DRV0
MOV [BATCH],0 ;Not found--turn off batch job
MOV AX,OFFSET TRANGROUP:DATINIT
MOV WORD PTR[INITADD],AX
MOV AX,[TRNSEG]
MOV WORD PTR[INITADD+2],AX
CALL DWORD PTR DS:[INITADD]
IF IBMVER
MOV DX,OFFSET RESGROUP:HEADER
MOV AH,PRINTBUF
INT 33
ENDIF
DRV0:
JMP HAVCOM
IF MSVER
HEADER DB 13,10,"Command v. 1.17"
IF HIGHMEM
DB "H"
ENDIF
DB 13,10,"$"
ENDIF
IF IBMVER
HEADER DB 13,10,13,10,"The IBM Personal Computer DOS",13,10
DB "Version 1.10 (C)Copyright IBM Corp 1981, 1982",13,10,"$"
DB "Licensed Material - Program Property of IBM"
ENDIF
INITSIZE EQU $-ZERO
INIT ENDS
;This TAIL segment is used to produce a PARA aligned label in the resident
; group which is the location where the transient segments will be loaded
; initialy.
TAIL SEGMENT PARA
ORG 0
TRANSTART LABEL WORD
TAIL ENDS
;********************************************************************
;START OF TRANSIENT PORTION
;This code is loaded at the end of memory and may be overwritten by
;memory-intensive user programs.
TRANCODE SEGMENT PARA
ASSUME CS:TRANGROUP,DS:TRANGROUP,ES:TRANGROUP,SS:TRANGROUP
WSWITCH EQU 1 ;Wide display during DIR
PSWITCH EQU 2 ;Pause (or Page) mode during DIR
VSWITCH EQU 4 ;Verify during COPY
ASWITCH EQU 8 ;ASCII mode during COPY
BSWITCH EQU 10H ;Binary mode during COPY
ORG 0
ZERO = $
ORG 100H ;Allow for 100H parameter area
SETDRV:
MOV AH,SELDRV
INT 21H
COMMAND:
CLD
MOV AX,CS
MOV SS,AX
MOV SP,OFFSET TRANGROUP:STACK
MOV ES,AX
MOV DS,AX
STI
MOV AX,46*100H
MOV DL,0
INT 33 ;Turn off verify after write
MOV AX,CS ;Get segment we're in
SUB AX,[TPA] ;AX=size ot TPA in paragraphs
MOV DX,16
MUL DX ;DX:AX=size of TPA in bytes
OR DX,DX ;See if over 64K
JZ SAVSIZ ;OK if not
MOV AX,-1 ;If so, limit to 65535 bytes
SAVSIZ:
MOV [BYTCNT],AX ;Max no. of bytes that can be buffered
CALL CRLF2
GETCOM:
MOV AH,GETDRV
INT 21H
MOV [CURDRV],AL
ADD AL,"A"
CALL OUT ;Print letter for default drive
MOV AL,SYM
CALL OUT
MOV DS,[RESSEG] ;All batch work must use resident seg.
ASSUME DS:RESGROUP
TEST [BATCH],-1
JNZ READBAT
PUSH CS
POP DS ;Need local segment to point to buffer
ASSUME DS:TRANGROUP
MOV DX,OFFSET TRANGROUP:COMBUF
MOV AH,INBUF
INT 21H ;Get a command
JMP DOCOM
;All batch proccessing has DS set to segment of resident portion
ASSUME DS:RESGROUP
NEEDPARM:
CALL GETBATBYT
CMP AL,"%" ;Check for two consecutive %
JZ SAVBATBYT
CMP AL,13 ;Check for end-of-line
JZ SAVBATBYT
SUB AL,"0"
JB RDBAT ;Ignore parameter reference if invalid
CMP AL,9
JA RDBAT
CBW
MOV SI,AX
SHL SI,1 ;Two bytes per entry
MOV SI,[SI+OFFSET RESGROUP:PARMTAB] ;Get pointer to corresponding parameter
CMP SI,-1 ;Check if parameter exists
JZ RDBAT ;Ignore if it doesn't
MOV AH,OUTCH
RDPARM:
LODSB ;From resident segment
CMP AL,0DH ;Check for end of parameter
JZ RDBAT
STOSB ;To transient segment
MOV DL,AL
INT 33 ;Display paramters too
JMP SHORT RDPARM
PROMPTBAT:
MOV AH,PRINTBUF
MOV DX,OFFSET RESGROUP:NEEDBAT
INT 33 ;Prompt for batch file
MOV AH,PRINTBUF
MOV DX,OFFSET RESGROUP:PROMPT
INT 33
MOV AX,0C00H+INCHAR
INT 33
JMP COMMAND
BADCOMJ1:JMP BADCOM
READBAT:
MOV DX,OFFSET RESGROUP:BATFCB
MOV AH,OPEN
INT 33 ;Make sure batch file still exists
OR AL,AL
JNZ PROMPTBAT ;If OPEN fails, prompt for disk
MOV WORD PTR [BATFCB+RECLEN],1
MOV DX,OFFSET RESGROUP:BATBYT
MOV AH,SETDMA
INT 33
MOV DI,OFFSET TRANGROUP:COMBUF+2
RDBAT:
CALL GETBATBYT
CMP AL,"%" ;Check for parameter
JZ NEEDPARM
SAVBATBYT:
STOSB
CALL OUT ;Display batched command line
CMP AL,0DH
JNZ RDBAT
SUB DI,OFFSET TRANGROUP:COMBUF+3
MOV AX,DI
MOV ES:[COMBUF+1],AL ;Set length of line
CALL GETBATBYT ;Eat linefeed
PUSH CS
POP DS ;Go back to local segment
ASSUME DS:TRANGROUP
DOCOM:
;All segments are local for command line processing
MOV AL,10
CALL OUT
MOV SI,OFFSET TRANGROUP:COMBUF+2
MOV DI,OFFSET TRANGROUP:IDLEN
MOV AX,2901H ;Make FCB with blank scan-off
INT 21H
CMP AL,1 ;Check for ambiguous command name
JZ BADCOMJ1 ;Ambiguous commands not allowed
CMP AL,-1
JNZ DRVGD
JMP DRVBAD
DRVGD:
MOV AL,[DI]
MOV [SPECDRV],AL
MOV AL," "
MOV CX,9
INC DI
REPNE SCASB ;Count no. of letters in command name
MOV AL,9
SUB AL,CL
MOV [IDLEN],AL
MOV DI,81H
MOV CX,0
PUSH SI
COMTAIL:
LODSB
STOSB ;Move command tail to 80H
CMP AL,13
LOOPNZ COMTAIL
NOT CL
MOV BYTE PTR DS:[80H],CL
POP SI
;If the command has 0 parameters must check here for
;any switches that might be present.
;SI -> first character after the command.
MOV [FLAGER],0 ;Set error flag before any calls to switch
CALL SWITCH ;Is the next character a "/"
MOV [COMSW],AX
MOV DI,FCB
MOV AX,2901H
INT 21H
MOV [PARM1],AL ;Save result of parse
CALL SWITCH
MOV [ARG1S],AX
MOV DI,FCB+10H
MOV AX,2901H
INT 21H ;Parse file name
MOV [PARM2],AL ;Save result
CALL SWITCH
MOV [ARG2S],AX
MOV AL,[IDLEN]
MOV DL,[SPECDRV]
OR DL,DL ;Check if drive was specified
JZ OK
JMP DRVCHK
OK: DEC AL ;Check for null command
JNZ FNDCOM
JMP GETCOM
RETSW:
XCHG AX,BX ;Put switches in AX
RET
SWITCH:
XOR BX,BX ;Initialize - no switches set
SWLOOP:
CALL SCANOFF ;Skip any delimiters
CMP AL,"/" ;Is it a switch specifier?
JNZ RETSW ;No -- we're finished
INC SI ;Skip over "/"
CALL SCANOFF
INC SI
;Convert lower case input to upper case
CMP AL,"a"
JB SAVCHR
CMP AL,"z"
JA SAVCHR
SUB AL,20H ;Lower-case changed to upper-case
SAVCHR:
MOV DI,OFFSET TRANGROUP:SWLIST
MOV CX,SWCOUNT
REPNE SCASB ;Look for matching switch
JNZ BADSW
MOV AX,1
SHL AX,CL ;Set a bit for the switch
OR BX,AX
JMP SHORT SWLOOP
BADSW:
MOV [FLAGER],1 ;Record error in switch
JMP SHORT SWLOOP
SWLIST DB "BAVPW"
SWCOUNT EQU $-SWLIST
DRVBAD:
MOV DX,OFFSET TRANGROUP:BADDRV
JMP ERROR
FNDCOM:
MOV SI,OFFSET TRANGROUP:COMTAB ;Prepare to search command table
MOV CH,0
FINDCOM:
MOV DI,OFFSET TRANGROUP:IDLEN
MOV CL,[SI]
JCXZ EXTERNAL
REPE CMPSB
LAHF
ADD SI,CX ;Bump to next position without affecting flags
SAHF
LODSB ;Get flag for drive check
MOV [CHKDRV],AL
LODSW ;Get address of command
JNZ FINDCOM
MOV DX,AX
CMP [CHKDRV],0
JZ NOCHECK
MOV AL,[PARM1]
OR AL,[PARM2] ;Check if either parm. had invalid drive
CMP AL,-1
JZ DRVBAD
NOCHECK:CALL DX
COMJMP: JMP COMMAND
BADCOMJ:JMP BADCOM
SETDRV1:
JMP SETDRV
DRVCHK:
DEC DL ;Adjust for correct drive number
DEC AL ;Check if anything else is on line
JZ SETDRV1
EXTERNAL:
MOV AL,[SPECDRV]
MOV [IDLEN],AL
MOV WORD PTR[COM],4F00H+"C" ;"CO"
MOV BYTE PTR[COM+2],"M"
MOV DX,OFFSET TRANGROUP:IDLEN
MOV AH,OPEN
INT 33 ;Check if command to be executed
MOV [FILTYP],AL ;0 for COM files, -1 for EXE files
OR AL,AL
JZ EXECUTE
MOV WORD PTR[COM],5800H+"E" ;"EX"
MOV BYTE PTR[COM+2],"E"
INT 33 ;Check for EXE file
OR AL,AL
JZ EXECUTE
MOV WORD PTR[COM],4100H+"B" ;"BA"
MOV BYTE PTR[COM+2],"T"
INT 33 ;Check if batch file to be executed
OR AL,AL
JNZ BADCOMJ
BATCOM:
;Batch parameters are read with ES set to segment of resident part
MOV ES,[RESSEG]
ASSUME ES:RESGROUP
MOV DI,OFFSET RESGROUP:PARMTAB
MOV AX,-1
MOV CX,10
REP STOSW ;Zero parameter pointer table
MOV SI,OFFSET TRANGROUP:COMBUF+2
MOV DI,OFFSET RESGROUP:PARMBUF
MOV BX,OFFSET RESGROUP:PARMTAB
EACHPARM:
CALL SCANOFF
CMP AL,0DH
JZ HAVPARM
MOV ES:[BX],DI ;Set pointer table to point to actual parameter
INC BX
INC BX
MOVPARM:
LODSB
CALL DELIM
JZ ENDPARM ;Check for end of parameter
STOSB
CMP AL,0DH
JZ HAVPARM
JMP SHORT MOVPARM
ENDPARM:
MOV AL,0DH
STOSB ;End-of-parameter marker
CMP BX,OFFSET RESGROUP:PARMTAB+20 ;Maximum number of parameters?
JB EACHPARM
HAVPARM:
MOV SI,OFFSET TRANGROUP:IDLEN
MOV DI,OFFSET RESGROUP:BATFCB
MOV CX,16
REP MOVSW ;Move into private batch FCB
XOR AX,AX
PUSH ES
POP DS ;Simply batch FCB setup
ASSUME DS:RESGROUP
MOV WORD PTR[BATFCB+RR],AX
MOV WORD PTR[BATFCB+RR+2],AX ;Zero RR field
INC AX
MOV WORD PTR[BATFCB+RECLEN],AX ;Set record length to 1 byte
MOV [BATCH],AL ;Flag batch job in progress
JMP COMMAND
ASSUME DS:TRANGROUP,ES:TRANGROUP
EXECUTE:
MOV AX,WORD PTR[IDLEN+16]
OR AX,WORD PTR[IDLEN+18] ;See if zero length
JZ BADCOM ;If so, error
XOR AX,AX
MOV WORD PTR[IDLEN+RR],AX
MOV WORD PTR[IDLEN+RR+2],AX ;Set RR field to zero
INC AX
MOV WORD PTR[IDLEN+RECLEN],AX ;Set record length field to 1
MOV DX,[TPA]
MOV BX,DX
MOV AH,SETBASE
INT 21H
TEST [FILTYP],-1 ;Check if file is COM or EXE
JZ COMLOAD
JMP EXELOAD
COMLOAD:PUSH DS
MOV DS,DX
MOV DX,100H
MOV AH,SETDMA
INT 21H
POP DS
MOV CX,[BYTCNT]
SUB CX,100H
MOV DX,OFFSET TRANGROUP:IDLEN
MOV AH,RDBLK
INT 21H
DEC AL
MOV DX,OFFSET TRANGROUP:TOOBIG
JNZ ERROR
;Set up exit conditions
MOV CX,[BYTCNT]
MOV DS,BX
MOV ES,BX
CLI
MOV SS,BX
MOV SP,CX
STI
SUB CX,100H ;Allow some stack space
XOR AX,AX
PUSH AX
MOV AX,100H
PUSH BX
PUSH AX
CALL SETUP
XXX PROC FAR
RET
XXX ENDP
BADCOM:
MOV DX,OFFSET TRANGROUP:BADNAM
ERROR:
MOV AH,PRINTBUF
INT 21H
JMP COMMAND
CHKCNT:
TEST [FILECNT],-1
JNZ ENDDIR
MOV DX,OFFSET TRANGROUP:NOTFND
JMP ERROR
ENDDIR:
;Make sure last line ends with CR/LF
MOV AL,[LINLEN]
CMP AL,[LINCNT] ;Will be equal if just had CR/LF
JZ MESSAGE
CALL CRLF2
MESSAGE:
MOV SI,[FILECNT]
XOR DI,DI
CALL DISP32BITS
MOV DX,OFFSET TRANGROUP:DIRMES
MOV AH,PRINTBUF
INT 21H
RET
CATALOG:
MOV AL,"?" ;*.* is default file spec.
MOV DI,5DH
MOV CX,11
REP STOSB
MOV SI,81H
CALL SWITCH
MOV DI,5CH
MOV AX,41*100H+0DH ;Parse with default name and extension
INT 33
;Begin by processing any switches that may have been specified.
;BITS will contain any information about switches that was
;found when the command line was parsed.
SETSWT:
MOV AX,[COMSW] ;Get switches from command
OR AX,[ARG1S] ;OR in switches from first parameter
MOV [BITS],AX
MOV BYTE PTR[FULLSCR],LINPERPAG
TEST AL,1 ;Look for /W
MOV AL,NORMPERLIN
JZ DIR
MOV AL,WIDEPERLIN
DIR:
MOV [LINLEN],AL ;Set number of entries per line
MOV [LINCNT],AL
MOV [FILECNT],0 ;Keep track of how many files found
MOV DX,OFFSET TRANGROUP:DIRBUF ;Set Disk transfer address
MOV AH,SETDMA
INT 21H
MOV AH,SRCHFRST
SHOWDIR:
MOV DX,5CH ;DX -> Unopened FCB
INT 21H ;Search for a file to match FCB
INC AL ;FF = file not found
JNZ AGAIN ;Either an error or we are finished
JMP CHKCNT
AGAIN:
INC [FILECNT] ;Keep track of how many we find
MOV SI,OFFSET TRANGROUP:DIRBUF+1 ;SI -> information returned by sys call
CALL SHONAME
TEST BYTE PTR[BITS],1 ;/W set?
JNZ NEXENT ;If so, no size, date, or time
CALL DISPSIZE ;Print size of file
CALL TWOSPC
MOV AX,WORD PTR[DIRBUF+25] ;Get date
OR AX,AX
JZ NEXENT ;Skip if no date
MOV DX,AX
MOV CL,5
SHR AX,CL ;Align month
AND AL,0FH
MOV BH,"0"-" " ;Enable zero suppression
CALL OUT2
MOV AL,"-"
CALL OUT
MOV AL,DL
AND AL,1FH ;Mask to day
CALL OUT2
MOV AL,"-"
CALL OUT
MOV AL,DH
SHR AL,1 ;Align year
ADD AX,80 ;Relative 1980
CMP AL,100
JB MILLENIUM
SUB AL,100
MILLENIUM:
CALL OUT2
MOV BX,WORD PTR[DIRBUF+23] ;Get time
OR BX,BX ;Time field present?
JZ NEXENT
CALL TWOSPC
SHR BX,1
SHR BX,1
SHR BX,1
SHR BL,1
SHR BL,1 ;Hours in BH, minutes in BL
MOV AL,BH
MOV DH,"a" ;Assume A.M.
CMP AL,12 ;In the afternoon?
JB MORN
MOV DH,"p"
JE MORN
SUB AL,12 ;Keep it to 12 hours or less
MORN:
OR AL,AL ;Before 1 am?
JNZ SHOHOURS
MOV AL,12
SHOHOURS:
MOV BH,"0"-" " ;Enable zero suppression
CALL OUT2
MOV AL,":"
CALL OUT
MOV AL,BL ;Output minutes
CALL OUT2
MOV AL,DH ;Get "a" or "p"
CALL OUT
NEXENT:
DEC [LINCNT]
JNZ SAMLIN
NEXLIN:
MOV AL,[LINLEN]
MOV [LINCNT],AL
CALL CRLF2
TEST BYTE PTR[BITS],2 ;/P switch present?
JZ SCROLL ;If not, just continue
DEC BYTE PTR[FULLSCR]
JNZ SCROLL
MOV BYTE PTR[FULLSCR],LINPERPAG
MOV AH,PRINTBUF
MOV DX,OFFSET TRANGROUP:PAUSMES
INT 33
MOV AX,0C08H ;Wait for any character to be typed
INT 21H
CALL CRLF2
SCROLL:
MOV AH,SRCHNXT
JMP SHOWDIR
SAMLIN:
MOV AL,9 ;Output a tab
CALL OUT
JMP SHORT SCROLL
SHONAME:
MOV CX,8
CALL OUTCNT
CALL ONESPC
MOV CX,3
OUTCNT:
LODSB
CALL OUT
LOOP OUTCNT
RET
TWOSPC:
CALL ONESPC
ONESPC:
MOV AL," "
JMP OUT
CRLF2:
MOV AL,13
CALL OUT
MOV AL,10
JMP OUT
DISPSIZE:
MOV SI,WORD PTR[DIRBUF+29]
MOV DI,WORD PTR[DIRBUF+31]
DISP32BITS:
;Prints the 32-bit number DI:SI on the console in decimal. Uses a total
;of 9 digit positions with leading blanks.
XOR AX,AX
MOV BX,AX
MOV BP,AX
MOV CX,32
CONVLP:
SHL SI,1
RCL DI,1
XCHG AX,BP
CALL CONVWRD
XCHG AX,BP
XCHG AX,BX
CALL CONVWRD
XCHG AX,BX
ADC AL,0
LOOP CONVLP
; Conversion complete. Print 9-digit number.
MOV CX,1810H ;Allow leading zero blanking for 8 digits
XCHG DX,AX
CALL DIGIT
XCHG AX,BX
CALL OUTWORD
XCHG AX,BP
OUTWORD:
PUSH AX
MOV DL,AH
CALL OUTBYTE
POP DX
OUTBYTE:
MOV DH,DL
SHR DL,1
SHR DL,1
SHR DL,1
SHR DL,1
CALL DIGIT
MOV DL,DH
DIGIT:
AND DL,0FH
JZ BLANKZER
MOV CL,0
BLANKZER:
DEC CH
AND CL,CH
OR DL,30H
SUB DL,CL
MOV AH,OUTCH
INT 21H
RET
CONVWRD:
ADC AL,AL
DAA
XCHG AL,AH
ADC AL,AL
DAA
XCHG AL,AH
RET20: RET
ERASE:
MOV CX,11
MOV SI,FCB+1
AMBSPEC:
LODSB
CMP AL,"?"
JNZ ALLFIL
LOOP AMBSPEC
ALLFIL:
CMP CX,0
JNZ NOPRMPT
ASKAGN:
MOV DX,OFFSET TRANGROUP:SUREMES ;"Are you sure (Y/N)?"
MOV AH,PRINTBUF
INT 21H
MOV AX,0C00H+INCHAR
INT 21H
AND AL,5FH
CMP AL,"N"
JZ RET20
CMP AL,"Y"
CALL CRLF2
JZ NOPRMPT
JMP SHORT ASKAGN
NOPRMPT:
MOV AH,DELETE
MOV BX,OFFSET TRANGROUP:NOTFND
CMP BYTE PTR DS:[FCB+1]," " ;Check if parameter exists
JMP SHORT OPFILE
RENAME:
MOV AH,RENAM
MOV BX,OFFSET TRANGROUP:RENERR
CMP BYTE PTR DS:[FCB+16+1]," " ;Check if parameter exists
OPFILE:
MOV DX,OFFSET TRANGROUP:MISNAM
JZ ERRJ ;Error if missing parameter
MOV DX,FCB
INT 21H
INC AL
JNZ RET20
MOV DX,BX
ERRJ: JMP ERROR
TYPEFIL:
MOV DS,[TPA]
XOR DX,DX
MOV AH,SETDMA
INT 21H
PUSH CS
POP DS
MOV DX,FCB
MOV AH,OPEN
INT 21H
OR AL,AL
MOV DX,OFFSET TRANGROUP:NOTFND
JNZ ERRJ
XOR AX,AX
MOV WORD PTR DS:[FCB+RR],AX ;Set RR field
MOV WORD PTR DS:[FCB+RR+2],AX
INC AX
MOV WORD PTR DS:[FCB+RECLEN],AX ;Set record length
MOV ES,[TPA]
TYPELP:
MOV DX,FCB
MOV CX,[BYTCNT]
MOV AH,RDBLK
INT 21H
JCXZ RET30
XOR SI,SI ;Start at 0 in TPA
OUTLP:
LODS BYTE PTR ES:[SI] ;In TPA segment
CMP AL,1AH
JZ RET30
MOV AH,OUTCH
MOV DL,AL
INT 21H
LOOP OUTLP
JMP SHORT TYPELP
RET30: RET ;Need a nearby RET
COPY:
XOR AX,AX
MOV [PLUS],AL ;Will keep track of "+"s
MOV [FILECNT],AX
MOV SI,81H ;Point to input line
CALL SWITCH ;Skip over switches on command
MOV BP,AX
MOV DI,FCB
CALL PARSNAM ;Scan first source
MOV [PARM1],DL ;Save ambiguous flag
MOV [SRCPT],SI ;Save pointer to command line
;Parse each name to find destination and check for /V switch
SCANNAM:
CALL PARSE
JNZ SCANNAM
GETDEST:
MOV DI,OFFSET TRANGROUP:DEST
MOV BX,BP ;Remeber switches so far
XOR BP,BP ;Must have dest. swtiches alone
CALL PARSNAM
MOV [ARG2S],BP ;Remember switches on destination
JNZ HAVDESTNAM ;File name present?
INC DI ;Point to file name spot
MOV AL,"?" ;Substitute *.*
MOV CX,11
REP STOSB
HAVDESTNAM:
OR BX,BP ;BX = all switches combined
AND BL,VSWITCH ;Verify requested?
JZ NOVER
MOV AX,46*100H+1 ;Set verify
MOV DL,0
INT 33
NOVER:
MOV DI,OFFSET TRANGROUP:DESTNAME
MOV SI,OFFSET TRANGROUP:DEST+1
MOV BX,FCB+1
CALL BUILDNAME ;See if we can make it unambiguous
MOV DI,OFFSET TRANGROUP:DESTNAME
MOV AL,"?"
MOV CX,11
REPNE SCASB ;Scan for "?" to see if ambiguous
MOV AL,1 ;Flag if ambig.
JZ AMBIG
DEC AX ;AL=0 if unambig.
AMBIG:
MOV DL,AL
MOV AH,[PLUS] ;1=found "+"
XOR AL,1 ;0=ambig, 1=unambig destination
AND AL,[PARM1] ;Source ambig. AND dest unambig.
OR AL,AH ;OR found "+" means concatenation
MOV [ASCII],AL ;Concatenation implies ASCII mode
MOV [INEXACT],AL ;ASCII implies inexact copy
SHL AL,1
OR AL,DL ;Combine multiple and concat flags
MOV [PARM2],AL
MOV AL,BYTE PTR[COMSW]
CALL SETASC ;Check /A,/B on command
MOV AL,BYTE PTR[ARG1S]
CALL SETASC ;Check for ASCII on first filename
MOV BYTE PTR[COMSW],AL ;Save starting switch values
MOV AH,SRCHFRST
CALL SEARCH ;Search for first source name
MULTDEST:
JZ FIRSTSRC ;Find a first source name?
TEST [PARM2],1 ;If multiple, we're done
JNZ ENDCOPY
XOR AX,AX
MOV [NXTADD],AX
MOV [CFLAG],AL ;Flag nothing read yet
NEXTSNG:
MOV DI,FCB
MOV SI,[SRCPT]
CALL PARSESRC ;Parse next file name into FCB
MOV [PARM1],DL ;Remember if it's ambiguous
MOV [SRCPT],SI
JZ SNGCLOS
MOV AH,SRCHFRST
CALL SEARCH ;Search for new file name
JNZ NEXTSNG ;If none, skip it and move to next name
READSNG:
CALL CHECKREAD
SNGLOOP:
CALL SEARCHNEXT ;See if any more of this name
JZ READSNG
JMP SHORT NEXTSNG
SNGCLOS:
CALL CLOSEFIL
ENDCOPY:
MOV SI,[FILECNT]
XOR DI,DI
CALL DISP32BITS
MOV DX,OFFSET TRANGROUP:COPIED
MOV AH,PRINTBUF
INT 21H
JMP COMMAND ;Stack could be messed up
FIRSTSRC:
MOV SI,OFFSET TRANGROUP:DIRBUF+1
MOV DI,OFFSET TRANGROUP:SOURCE
MOV CX,11
REP MOVSB ;Copy first source name to SOURCE
MOV SI,OFFSET TRANGROUP:DESTNAME
MOV DI,OFFSET TRANGROUP:DEST+1
MOV BX,OFFSET TRANGROUP:SOURCE
CALL BUILDNAME ;Build destination name
XOR AX,AX
MOV [NXTADD],AX
MOV [CFLAG],AL
MOV [APPEND],AL
MOV [NOWRITE],AL
TEST [PARM2],1 ;Multiple destinations?
JZ NOPRT
MOV SI,OFFSET TRANGROUP:DIRBUF+1
CALL SHONAME ;If so, show first source
CALL CRLF2
NOPRT:
CALL COMPNAME ;Source and dest. the same?
JNZ DOREAD ;If not, read source in
TEST [PARM2],2 ;Concatenation?
MOV DX,OFFSET TRANGROUP:OVERWR
JZ COPERRJ ;If not, overwrite error
MOV [APPEND],1 ;Set physical append
MOV AH,OPEN
MOV DX,OFFSET TRANGROUP:DEST
INT 33 ;Open (existing) destination
CMP [ASCII],0 ;ASCII flag set?
JZ BINARYAPP
;ASCII append. Must find logical EOF, then seek there with dest. FCB
MOV [NOWRITE],1
CALL READIN ;Find EOF
CALL FLSHFIL ;Seek there
MOV [NOWRITE],0
CALL FLSHFIL ;Truncate file
JMP SHORT SNGLCHK
SNGLOOPJ:JMP SNGLOOP
COPERRJ:JMP COPERR
BINARYAPP:
MOV WORD PTR[DEST+RECLEN],1 ;Set record length to 1
MOV SI,OFFSET TRANGROUP:DEST+16 ;Point to file size
MOV DI,OFFSET TRANGROUP:DEST+RR
MOVSW
MOVSW ;Seek to end of file
MOV [CFLAG],1
JMP SHORT SNGLCHK
DOREAD:
CALL READIN
SNGLCHK:
TEST [PARM2],1 ;Single or multiple destinations?
JZ SNGLOOPJ
MOV SI,[SRCPT]
MULTAPP:
CALL PARSE
JZ MULTCLOS
PUSH SI
MOV SI,OFFSET TRANGROUP:DIRBUF+1
MOV DI,SI
MOV BX,OFFSET TRANGROUP:SOURCE
CALL BUILDNAME
CALL CHECKREAD
POP SI
JMP SHORT MULTAPP
MULTCLOS:
CALL CLOSEFIL
MOV AL,BYTE PTR[COMSW]
MOV [ASCII],AL ;Restore ASCII flag
CALL SEARCHNEXT
JMP MULTDEST
PARSE:
MOV DI,OFFSET TRANGROUP:DIRBUF
PARSESRC:
CALL SCANOFF
CMP AL,"+"
JNZ RETZF
MOV [PLUS],1 ;Keep track of "+" signs
INC SI ;Skip over it
PARSNAM:
MOV AX,2901H
INT 33 ;Parse file name
CMP AL,-1 ;Illegal?
MOV DX,OFFSET TRANGROUP:BADDRV
JZ COPERRJ
XCHG AX,DX ;Save parse flag in DL
MOV AL,BYTE PTR[DI] ;Get drive number
OR AL,AL ;Is it default?
JNZ PARSW
MOV AL,[CURDRV] ;Substitute actual drive
INC AX
MOV BYTE PTR[DI],AL
PARSW:
PUSH BX
PUSH DI
CALL SWITCH ;Process switches
OR BP,AX ;Combine all switches
CALL SETASC ;Check for /A or /B
POP DI
POP BX
CMP BYTE PTR[DI+1]," " ;Did we even get a file name?
RET
RETZF:
XOR AX,AX
RET35: RET
SEARCHNEXT:
MOV AL,[PARM1] ;Is name ambiguous?
DEC AL
JNZ RET35 ;Don't perform search if not
MOV AH,SRCHNXT
SEARCH:
PUSH AX
MOV AH,SETDMA
MOV DX,OFFSET TRANGROUP:DIRBUF
INT 33 ;Put result of search in DIRBUF
POP AX ;Restore search first/next command
MOV DX,FCB
INT 33 ;Do the search
OR AL,AL
RET
SETASC:
;Given switch vector in AX,
; Set ASCII switch if /A is set
; Clear ASCII switch if /B is set
; Leave ASCII unchanged if neither or both are set
; Also sets INEXACT if ASCII is ever set. AL = ASCII on exit, flags set
AND AL,ASWITCH+BSWITCH
JPE LOADSW ;PE means both or neither are set
AND AL,ASWITCH
MOV [ASCII],AL
OR [INEXACT],AL
LOADSW:
MOV AL,[ASCII]
OR AL,AL
RET
BUILDNAME:
; [SI] = Ambiguous input file name
; [BX] = Source of replacement characters
; [DI] = Destination
; File name is copied from [SI] to [DI]. If "?"s are encountered,
; they are replaced with the character in the same position at [BX].
MOV CX,11
BUILDNAM:
LODSB
CMP AL,"?"
JNZ NOTAMBIG
MOV AL,BYTE PTR[BX]
NOTAMBIG:
STOSB
INC BX
LOOP BUILDNAM
RET
COMPNAME:
MOV SI,OFFSET TRANGROUP:DEST
MOV DI,OFFSET TRANGROUP:DIRBUF
MOV CX,6
REPE CMPSW
RET
CHECKREAD:
;Read file in (with READIN) if not identical to destination
CALL COMPNAME ;See if source and destination the same
JNZ READIN
CMP [APPEND],0 ;If physical append, it's OK
JNZ RET40
MOV DX,OFFSET TRANGROUP:LOSTERR ;Tell him he's not going to get it
MOV AH,PRINTBUF
INT 33
RET40: RET
READIN:
;Open source file and read it in. If memory fills up, flush it out to
;destination and keep reading. If /A switch set, chop file at first ^Z.
; Inputs/Outputs:
; [NXTADD] has current pointer in buffer
; [CFLAG] <>0 if destination has been created
MOV DX,OFFSET TRANGROUP:DIRBUF
MOV AH,OPEN
INT 21H
OR AL,AL ;Successful open?
JNZ RET40 ;If not, just ignore it
XOR AX,AX
MOV WORD PTR[DIRBUF+RR],AX
MOV WORD PTR[DIRBUF+RR+2],AX
INC AX
MOV WORD PTR[DIRBUF+RECLEN],AX
COPYLP:
MOV DX,[NXTADD]
MOV AH,SETDMA
PUSH DS
MOV DS,[TPA]
INT 33
POP DS
MOV CX,[BYTCNT]
SUB CX,DX ;Compute available space
MOV DX,OFFSET TRANGROUP:DIRBUF
MOV AH,RDBLK ;Read in source file
INT 21H
JCXZ RET40
CMP [ASCII],0
JZ BINREAD
MOV DX,CX
MOV DI,[NXTADD]
MOV AL,1AH
PUSH ES
MOV ES,[TPA]
REPNE SCASB ;Scan for EOF
POP ES
JNZ USEALL
INC CX
USEALL:
SUB DX,CX
MOV CX,DX
BINREAD:
ADD CX,[NXTADD]
MOV [NXTADD],CX
CMP CX,[BYTCNT] ;Is buffer full?
JB RET40 ;If not, we must have found EOF
CALL FLSHFIL
JMP SHORT COPYLP
CLOSEFIL:
MOV AX,[NXTADD]
MOV BX,AX
OR AL,AH ;See if any data is loaded
OR AL,[CFLAG] ; or file was created
JZ RET50 ;Don't close or count if not created
MOV AL,BYTE PTR[ARG2S]
CALL SETASC ;Check for /B or /A on destination
JZ BINCLOS
CMP BX,[BYTCNT] ;Is memory full?
JNZ PUTZ
CALL FLSHFIL ;Empty it to make room for 1 lousy byte
XOR BX,BX
PUTZ:
PUSH DS
MOV DS,[TPA]
MOV WORD PTR[BX],1AH ;Add End-of-file mark (Ctrl-Z)
POP DS
INC [NXTADD]
BINCLOS:
CALL FLSHFIL
CMP [INEXACT],0 ;Copy not exact?
JNZ NODATE ;If so, don't copy date & time
MOV SI,OFFSET TRANGROUP:DIRBUF+OFFDATE
MOV DI,OFFSET TRANGROUP:DEST+OFFDATE ;Make date & time same as original
MOVSW ;Copy date
MOVSW ;Copy time
NODATE:
MOV DX,OFFSET TRANGROUP:DEST
MOV AH,CLOSE
INT 21H
INC [FILECNT]
RET50: RET
FLSHFIL:
;Write out any data remaining in memory.
; Inputs:
; [NXTADD] = No. of bytes to write
; [CFLAG] <>0 if file has been created
; Outputs:
; [NXTADD] = 0
MOV AL,1
XCHG [CFLAG],AL
OR AL,AL
JNZ EXISTS
CMP [NOWRITE],0
JNZ SKPMAK ;Don't actually create if NOWRITE set
MOV DX,OFFSET TRANGROUP:DEST
MOV AH,MAKE
INT 21H
MOV DX,OFFSET TRANGROUP:FULDIR
OR AL,AL
JNZ COPERR
SKPMAK:
XOR AX,AX
MOV WORD PTR[DEST+RR],AX
MOV WORD PTR[DEST+RR+2],AX
INC AX
MOV WORD PTR[DEST+RECLEN],AX
EXISTS:
XOR CX,CX
XCHG CX,[NXTADD]
CMP [NOWRITE],0 ;If NOWRITE set, just seek CX bytes
JNZ SEEKEND
XOR DX,DX
PUSH DS
MOV DS,[TPA]
MOV AH,SETDMA
INT 33
POP DS
MOV DX,OFFSET TRANGROUP:DEST
MOV AH,WRBLK
INT 21H
OR AL,AL
JZ RET60
MOV DX,OFFSET TRANGROUP:DEST
MOV AH,CLOSE
INT 21H
MOV AH,DELETE
INT 33
MOV DX,OFFSET TRANGROUP:NOSPACE
COPERR:
MOV AH,9
INT 21H
JMP ENDCOPY
SEEKEND:
ADD WORD PTR[DEST+RR],CX
ADC WORD PTR[DEST+RR+2],0 ;Propagate carry
RET60: RET
GETBATBYT:
;Get one byte from the batch file and return it in AL. End-of-file
;returns <CR> and ends batch mode. DS must be set to resident segment.
;AH, CX, DX destroyed.
ASSUME DS:RESGROUP
MOV DX,OFFSET RESGROUP:BATFCB
MOV AH,RDBLK
MOV CX,1
INT 33 ;Get one more byte from batch file
JCXZ BATEOF
MOV AL,[BATBYT]
CMP AL,1AH
JNZ RET70
BATEOF:
MOV AL,0DH ;If end-of-file, then end of line
MOV [BATCH],0 ;And turn off batch mode
RET70: RET
ASSUME DS:TRANGROUP
SCANOFF:
LODSB
CALL DELIM
JZ SCANOFF
DEC SI ;Point to first non-delimiter
RET
DELIM:
CMP AL," "
JZ RET80
CMP AL,"="
JZ RET80
CMP AL,","
JZ RET80
CMP AL,9 ;Check for TAB character
RET80: RET
PAUSE:
MOV DX,OFFSET TRANGROUP:PAUSMES
MOV AH,PRINTBUF
INT 33
MOV AX,0C00H+INCHAR ;Get character with KB buffer flush
INT 33
RET90: RET
;Date and time are set during initialization and use
;this routines since they need to do a long return
DATINIT:
PUSH ES
PUSH DS ;Going to use the previous stack
MOV AX,CS ;Set up the appropriate segment registers
MOV ES,AX
MOV DS,AX
MOV WORD PTR DS:[81H],13 ;Want to prompt for date during initialization
CALL DATE
CALL TIME
POP DS
POP ES
YYY PROC FAR
RET
YYY ENDP
; DATE - Gets and sets the time
DATE:
MOV SI,81H ;Accepting argument for date inline
CALL SCANOFF
CMP AL,13
JZ PRMTDAT
MOV BX,2F00H+"-" ;"/-"
CALL INLINE
JMP COMDAT
PRMTDAT:
MOV DX,OFFSET TRANGROUP:CURDAT
MOV AH,PRINTBUF
INT 33 ;Print "Current date is "
MOV AH,GETDATE
INT 33 ;Get date in CX:DX
CBW
MOV SI,AX
SHL SI,1
ADD SI,AX ;SI=AX*3
ADD SI,OFFSET TRANGROUP:WEEKTAB
MOV BX,CX
MOV CX,3
CALL OUTCNT
MOV AL," "
CALL OUT
MOV AX,BX
MOV CX,DX
MOV DL,100
DIV DL
XCHG AL,AH
XCHG AX,DX
MOV BL,"-"
CALL SHOW
GETDAT:
MOV DX,OFFSET TRANGROUP:NEWDAT
MOV BX,2F00H+"-" ;"/-" in BX
CALL GETBUF
COMDAT: JZ RET90
JC DATERR
LODSB
CMP AL,BL
JZ SEPGD
CMP AL,BH
JNZ DATERR
SEPGD: CALL GETNUM
JC DATERR
MOV CX,1900
CMP BYTE PTR[SI],13
JZ BIAS
MOV AL,100
MUL AH
MOV CX,AX
CALL GETNUM
JC DATERR
BIAS:
MOV AL,AH
MOV AH,0
ADD CX,AX
LODSB
CMP AL,13
JNZ DATERR
MOV AH,SETDATE
INT 33
OR AL,AL
JNZ DATERR
JMP RET90
DATERR:
MOV DX,OFFSET TRANGROUP:BADDAT
MOV AH,PRINTBUF
INT 33
JMP GETDAT
; TIME gets and sets the time
TIME:
MOV SI,81H ;Accepting argument for time inline
CALL SCANOFF
CMP AL,13
JZ PRMTTIM
MOV BX,3A00H+":"
CALL INLINE
JMP COMTIM
PRMTTIM:
MOV DX,OFFSET TRANGROUP:CURTIM
MOV AH,PRINTBUF
INT 33 ;Print "Current time is "
MOV AH,GETTIME
INT 33 ;Get time in CX:DX
MOV BL,":"
CALL SHOW
GETTIM:
XOR CX,CX ;Initialize hours and minutes to zero
MOV DX,OFFSET TRANGROUP:NEWTIM
MOV BX,3A00H+":"
CALL GETBUF
COMTIM: JZ RET100 ;If no time present, don't change it
JC TIMERR
MOV CX,DX
XOR DX,DX
LODSB
CMP AL,13
JZ SAVTIM
CMP AL,BL
JNZ TIMERR
MOV BL,"."
CALL GETNUM
JC TIMERR
MOV DH,AH ;Position seconds
LODSB
CMP AL,13
JZ SAVTIM
CMP AL,BL
JNZ TIMERR
CALL GETNUM
JC TIMERR
MOV DL,AH
LODSB
CMP AL,13
JNZ TIMERR
SAVTIM:
MOV AH,SETTIME
INT 33
OR AL,AL
JZ RET100 ;Error in time?
TIMERR:
MOV DX,OFFSET TRANGROUP:BADTIM
MOV AH,PRINTBUF
INT 33 ;Print error message
JMP GETTIM ;Try again
GETBUF:
MOV AH,PRINTBUF
INT 33 ;Print "Enter new date: "
MOV AH,INBUF
MOV DX,OFFSET TRANGROUP:COMBUF
INT 33 ;Get input line
CALL CRLF2
MOV SI,OFFSET TRANGROUP:COMBUF+2
CMP BYTE PTR[SI],13 ;Check if new date entered
JZ RET100
INLINE:
CALL GETNUM ;Get one or two digit number
JC RET100
MOV DH,AH ;Put in position
LODSB
CMP AL,BL
JZ NEXT
CMP BL,":" ;Is it a date seperator?
JNZ DATESEP
DEC SI
MOV DL,0
RET100: RET ;Time may have only an hour specified
DATESEP:
CMP AL,BH
STC
JNZ RET100
NEXT: CALL GETNUM
MOV DL,AH ;Put in position
RET
GETNUM:
CALL INDIG
JC RET100
MOV AH,AL ;Save first digit
CALL INDIG ;Another digit?
JC OKRET
AAD ;Convert unpacked BCD to decimal
MOV AH,AL
OKRET:
OR AL,1
RET110: RET
INDIG:
MOV AL,BYTE PTR[SI]
SUB AL,"0"
JC RET110
CMP AL,10
CMC
JC RET110
INC SI
RET
SHOW:
MOV AL,CH
MOV BH,"0"-" " ;Enable leading zero suppression
CALL OUT2
MOV AL,BL
CALL OUT
MOV AL,CL
CALL OUT2
MOV AL,BL
CALL OUT
MOV AL,DH
CALL OUT2
CMP BL,":" ;Are we outputting time?
JNZ SKIPIT
MOV AL,"."
CALL OUT
SKIPIT: MOV AL,DL
OUT2: ;Output binary number as two ASCII digits
AAM ;Convert binary to unpacked BCD
XCHG AL,AH
OR AX,3030H ;Add "0" bias to both digits
CMP AL,"0" ;Is MSD zero?
JNZ NOSUP
SUB AL,BH ;Suppress leading zero if enabled
NOSUP:
MOV BH,0 ;Disable zero suppression
CALL OUT
MOV AL,AH
OUT:
;Print char in AL without affecting registers
XCHG AX,DX
PUSH AX
MOV AH,OUTCH
INT 33
POP AX
XCHG AX,DX
RET
EXELOAD:
MOV AX,CS
ADD AX,LOADSEG
MOV [EXEEND],AX ;Store in EXEEND
MOV DX,OFFSET TRANGROUP:RUNVAR ;Read header in here
MOV AH,SETDMA
INT 33
MOV CX,RUNVARSIZ ;Amount of header info we need
MOV DX,OFFSET TRANGROUP:EXEFCB
MOV AH,RDBLK
INT 33 ;Read in header
OR AL,AL
JNZ BADEXE ;Must not reach EOF
MOV AX,[HEADSIZ] ;Size of header in paragraphs
;Convert header size to 512-byte pages by multiplying by 32 & rounding up
ADD AX,31 ;Round up first
MOV CL,5
SHR AX,CL ;Multiply by 32
MOV [EXEFCB+RR],AX ;Position in file of program
MOV WORD PTR[EXEFCB+RECLEN],512 ;Set record size
ADD BX,10H ;First paragraph above parameter area
MOV DX,[PAGES] ;Total size of file in 512-byte pages
SUB DX,AX ;Size of program in pages
MOV [PSIZE],DX
SHL DX,CL ;Convert pages back to paragraphs
MOV AX,DX
ADD DX,BX ;Size + start = minimum memory (paragr.)
MOV CX,[EXEEND] ;Get memory size in paragraphs
CMP DX,CX ;Enough memory?
JA SHRTERR
MOV DX,[INITSP]
ADD DX,15
SHR DX,1
SHR DX,1
SHR DX,1
SHR DX,1
ADD DX,[INITSS]
ADD DX,BX ;Adjusted value of SP
CMP DX,CX ;Is it valid?
JA SHRTERR
CMP [LOADLOW],-1 ;Load low or high?
JZ LOAD ;If low, load at segment BX
SUB CX,AX ;Memory size - program size = load addr.
MOV BX,CX
LOAD:
MOV BP,BX ;Save load segment
LOAD1:
LOADSEG EQU (LOAD1-ZERO)/16
PUSH DS
MOV DS,BX
XOR DX,DX ;Address 0 in segment
MOV AH,SETDMA
INT 33 ;Set load address
POP DS
MOV CX,[PSIZE] ;Number of records to read
MOV DX,OFFSET TRANGROUP:EXEFCB
MOV AH,RDBLK
INT 33 ;Read in up to 64K
SUB [PSIZE],CX ;Decrement count by amount read
JZ HAVEXE ;Did we get it all?
TEST AL,1 ;Check return code if not
JNZ BADEXE ;Must be zero if more to come
ADD BX,1000H-20H ;Bump data segment 64K minus one record
JMP SHORT LOAD1 ;Get next 64K block
BADEXE:
MOV DX,OFFSET TRANGROUP:EXEBAD
JMP ERROR
SHRTERR:
MOV DX,OFFSET TRANGROUP:TOOBIG
JMP ERROR
HAVEXE:
MOV AX,[RELTAB] ;Get position of table
MOV [EXEFCB+RR],AX ;Set in random record field
MOV WORD PTR[EXEFCB+RECLEN],1 ;Set one-byte record
MOV DX,OFFSET TRANGROUP:RELPT ;4-byte buffer for relocation address
MOV AH,SETDMA
INT 33
CMP [RELCNT],0
JZ NOREL
RELOC:
MOV AH,RDBLK
MOV DX,OFFSET TRANGROUP:EXEFCB
MOV CX,4
INT 33 ;Read in one relocation pointer
OR AL,AL ;Check return code
JNZ BADEXE
MOV DI,[RELPT] ;Get offset of relocation pointer
MOV AX,[RELSEG] ;Get segment
ADD AX,BP ;Bias segment with actual load segment
MOV ES,AX
ADD WORD PTR ES:[DI],BP ;Relocate
DEC [RELCNT] ;Count off
JNZ RELOC
;Set up exit conditions
NOREL:
MOV AX,[INITSS]
ADD AX,BP
CLI
MOV SS,AX ;Initialize SS
MOV SP,[INITSP]
STI
ADD [INITCS],BP
MOV AX,[TPA] ;Get pointer to parameter area
MOV CX,[BYTCNT] ;Size of TPA segment
MOV ES,AX
MOV DS,AX ;Set segment registers to point to it
CALL SETUP
JMP DWORD PTR CS:[INITIP] ;Long jump to program
SETUP:
AND CL,0F0H ;Adjust to even paragraph boundary
MOV AX,WORD PTR DS:[6] ;Get current memory size
SUB AX,CX ;Find out how much we're changing it
MOV WORD PTR DS:[6],CX
MOV CL,4
SAR AX,CL ;Convert to a segment address
ADD WORD PTR DS:[8],AX ;Adjust long jump to go to same place
MOV DX,80H
MOV AH,SETDMA
INT 33 ;Set default disk transfer address
MOV AX,WORD PTR CS:[PARM1] ;Pass on info about FCBs
XOR CX,CX
MOV DX,CX ;Assume no batch file
ASSUME CS:RESGROUP
TEST CS:[BATCH],-1 ;Batch file in progress?
ASSUME CS:TRANGROUP
JZ RET120 ;If not, all set up
MOV CX,CS:[RESSEG]
MOV DX,OFFSET RESGROUP:BATFCB ;CX:DX points to batch FCB
RET120: RET
TRANCODESIZE EQU $-ZERO
TRANCODE ENDS
COMLEN EQU TRANDATASIZE+TRANCODESIZE-102H ;End of COMMAND load. ZERO Needed to make COMLEN absolute
TRNLEN EQU (PRETRLEN+TRANCODESIZE+TRANDATASIZE+15)/16 ;Length of transient in paragraphs
END PROGSTART

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